Island



(No Model.)

F.R.STAFFOR[D. APPARATUS FOR MANUFACTURING FINGER RINGS.

Patented Jan. 29, 1895.

G M H E 'lullvl I I y llniTnn STATES PATENT @rrion. I

FRANK R. STAFFORD, OF PROVIDENCE, RHODE ISLAND.

APPARATUS FOR MANUFACTURING FINGER-RINGS.

SPECIFICATION forming part of Letters latentNo. 533,182, dated January29, 1895.

Application filed July 27, 1894- Zb all whom it may concern:

Be it known that I, FRANK R. STAFFORD, of the city and county ofProvidence, in the State of Rhode Island, have invented a certain newand useful Improvement in Apparatus for Manufacturing Finger-Rings; andI declare the following to be a specification thereof, reference beinghad to the accompanying drawings.

Like letters indicate like parts.

Figure 1 is a top plan and side elevation of the metallic blank, fromwhich the ring is to be made. Fig. 2 shows in diametrical verticalsection the dies, die-block, plunger and said blank, and in sideelevation, one of the collars, within which the blank is contained. Inthis figure the parts are in position for the first operation. Fig. 3shows the same parts in like section and elevation, but at the end ofthe first operation. Fig. at is a diametrical section of the stock afterthe first operation. Fig. 5 shows the second operation and the shape ofthe dies for accomplishing the same. Fig. 6 shows the product of thesecond operation. Fig. 7 shows the third operation and the shape of thedies for accomplishing the same. Fig. 8 shows the product of the thirdoperation. Fig. 9 is a top plan of the two collars for shaping theexterior surface and edges of the ring. Fig. 10 is a side elevation ofone of said collars, as seen on the interior surface thereof. Fig. 11 isa top plan showing the two collars in operative contact. Figs. 12 and 13are a top plan and diametrical section of the finished ring.

My invention relates to the manufacture of solid (seamless andunsoldered) rings of gold or other homogeneous metal, and consists inthe use of a collar in two parts, having a ma trix or groove to giveshape to the exterior surface and edges of the ring, and dies ofpeculiar shapes, mounted respectively in a plunger and die-block, andadapted to successively indent and push outwardly the central portion ofa disk or blank of gold, or other metal, into said matrix or groove,until only a mere diaphragm of metal is left in the center of the blank,so treated, which is removed by burring, and lournishing down the inte-Serial No. 513.708- (No model-l rior surface of the ring, as hereinafterparticularly specified.

The gold or other metallic disk or blank is shown at A in Fig. l in topplan and side elevation. I use in my improved process of ringmanufacturea plunger B and a die-block C, in which, respectively, are mountedcentrally the dies D and E.

The dies D E each have a central cylindrical projection terminating in aconical point. I use also a collar F, made in two parts, having theplane faces a and a semi-tubular opening 1), which, when the two partsof the collar are placed in contact on their plane faces a, as shown inFig. 11, constitute a central tubular bore.

At right angles to the axis of this bore 1s an annular groove or matrix0, made of such shape as is desired to fashion the exterior surface andedges of the ring.

The parts are at first put in the position shown in Fig. 2, in which itis seen that the blank A is within the groove 0 of the collar F, which,however, it does not fill, and between the points of theconically-shaped dies D E. The collar F does not now fill the centralsocket cl of the die-block 0, because of the interposition of the blankA between the dies D E. Power, applied to the plunger B in the directionindicated by the arrow 0:, causes the points of the dies D E topenetrate the central portions of the blank A on both sides thereof,until said points almost meet, when the plunger has traveled the fullextent of its stroke and the collar is forced to the bottom of thesocket d. The conical or tapering sides of the dies D E cause the metalof the blank to spread radially, until the edges of the blank arethickened or swaged and conform to and fill the groove 0 of the collarF.'Theresult of this operation is shown in diametrical section at G, inFig. 4, and consists, as there seen, of a metallic body, having paralleltop and bottom, circular edges, a convex circumference and two centralconical indentations. In the second operation, illustrated in Fig. 5, Iuse the same grooved collar F, with the plunger and die lolock, asbefore; but the dies D E each have now a convex end. The piece G, whichwas the product of the first operation, is placed between the dies D E,and when the plunger has acted to still further spread or swage themetal radially, the result is as shown at H, in Fig. 6, in diametricalsection.

The third operation, illustrated in Fig. 7, is similar, except that thedies D E" have practically square ends, with slightly rounded edges. Thepiece H is subjected to this operation and the result is shown indiametrical section at I in Fig. 8, in which it is seen that only a thinpartition or diaphragm z of metal now remains, slightly thickened at itsline of contact with the walls of the ring. This diaphragm z is nowburred out in the usual manner and the interior of the ring, so formed,is burnished down and the finished ring is seen in top plan anddiametrical section in Figs. 12 and 13.

If desired, the groove 0 of the collar F may have any design,ornamentation or figures, engraved, sunk or raised therein, to give acorresponding ornamentation to the exterior surface of the ring. Theswaging or spreading of the blank under the pressure of the plungerforces the metal into the exact shape, configuration and design of theannular groove or matrix 0 of the collar F.

It is also obvious that the groove 0 may be made rectangular in sectionor of any other desired shape.

Iclaim as a novel and useful invention and desire to secure by LettersPatent 1. A device of the class described comprising a die-block, a dietherein, a collar surrounding said die and divided diametrically into aplurality of parts, a plunger adjacent the die block and a second die insaid plunger adapted to enter the said collar and into opposition to thedie in the block.

2. A device of the class described comprising a die-block adapted toreceive a removable die, a collar surrounding said die movablelongitudinally thereof and divided diametrically iuto a plurality ofparts, a plunger adjacent the die block, and a die removably arranged inthe plunger to be depressed into the collar and into opposition to thedie in the block.

3. A device of the class described comprising a die block, a dietherein, a collar sur-' rounding said die and movable longitudinallythereof and adapted to receive and retain the stock to be operated upon,a plunger ad jacent the die-block and a second die in the plungeradapted to enter said collar and into opposition to the die in theblock.

4. A device of the class described comprising a die block, a dietherein, a collar surrounding said die and divided diametrically into aplurality of parts and movable longitudinally of the die, a plungeradjacent the die block, and a second die in the plunger adapted to entersaid collar and into opposition to the die in the block.

5. A device of the class described, comprising a die-block having a dietherein, a separable collar surrounding said die, a plunger adjacent thedie-block, and a second die in said plunger adapted to enter the saidcollar and into opposition with the die in the block.

FRANK R. STAFFORD.

WVitnesses:

WARREN R. PERCE, DANIEL W. FINK.

